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Patented Aug. 12, 1890.

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D. I. CRAIG I ADDING MAGHINB.

:No. 434,251. Patented Aug. 12, 1890.

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. D. I. CRAIG ADDING MACHINE.

No. 434.251. I Patented Aug. 12, 1890.

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v I "mull IHIHHH i HMUMH HH I UNITED STATES PATENT OFFICE.

DUDLEY I. CRAIG, OF SILVER KING, ARIZONA TERRITORY.

ADDING-MACHINE.

SPECIFICATION forming part of Letters Patent N 0. 434,251, dated August12, 1890.

Application filed May 1'7, 1889.

To all whom it may concern.-

Be it known that I, DUDLEY I. CRAIG, acitizen of the United States,residing at Silver King, in the county of Pinal and Territory ofArizona, have invented certain new and useful Improvements inAdding-Machines; and I hereby declare the following to be a full, clear,and exact specification, such as will enable others skilled in the artto which it appertains to make and use the same.

My invention relates to improvements in adding-machines; and among otherthings the object of my invention is to provide the machine withmechanism for automatically and accurately adding one or more columns offigures by simply depressing the desired keys of aseries of keys whichform a part of the machine; to provide mechanism for placing the primemoving mechanism in condition for operation Without affecting the normal position of the adding contrivances of the machine; to providemechanism for independently returning either the primary tens orhundreds adding wheels and arbors to their normal positions after addingthe column of figures, and to improve the machine in minor details witha View to promoting simplicity of construction and eiiiciency inoperation.

WVith these and other ends in view the first part of my inventionconsists in an adding mechanism comprising a series of keys, each havingan arm or projection which acts on one of a series of rods or arms of arock-shaft, a primary tens adding-wheel, a hundredswheel arranged to bemoved one notch or step at each complete revolution of the tens-wheel, amaster gear-wheel which is normally out of engagement with the tensadding-wheel, mechanism for impelling the tens addingwheel in onedirection, a brake for normally arresting the motion of the tensadding-wheel, and devices operated by the rock-shaft to simultaneouslythrow the master-gear into engagement with the primary tens addingwheeland withdraw the brake from engagement with said primary or tens adding-wheel, whereby the primary addingwheel and mastcr gear are rotated bythe prime 'moving mechanism until said wheels are arrested by a stop,which is thrown into the path of the Serial No. 311,324. (No model.)

master-gear by the depressed key, which starts the machine in motion.Each key, of which there are ninety-ninein number, has its rod connectedto a lever, which levers are compactly arranged in the lower part of themachine, and to the other end of each keylever is connected avertically-movable stop or pin which normally lies below the plane ofrotation of the master-gear. The stops or pins are arranged inconcentric banks or rows around the periphery of the master-gear, thenumber of stops corresponding to the number of keys, and the master-gearhas a projection or stop which extends beyond its periphery, to bestruck by the key-stop when the latter is lifted, the mastergear turningthe desired number of cogs before it is arrested by the key-stop.Thus,if the key 5 is depressed, the master-gear and primary adding-wheelmove five cogs. If the key 50 is depressed, said Wheels turn fifty cogsbefore the key-stop 50 arrests the motion of the master-gear and primaryadding-wheel. 1

My invention further consists in a prime moving mechanism for actuatingthe primary or tens adding-wheel when released from its brake, whichprime moving mechanism consists of a series of geared wheels and astrong motive spring. This spring can be readily wound up withoutaffecting the other parts of the. apparatus by an intermediate train ofgears, one of which has a loose pinion with which meshes a worm on acrank-shaft adapted to be rotated by the hand, the loose pinion of thetrain of gears having means or a ratchet for preventing retrogrademovement of said pinion.

My invention further consists in devices for independently returningeither the pri mary adding-wheel or the hundreds addingwhcel to itsnormal position. The device for returning the primary tens-wheel to itsnormal position at zero consists of a key located near the tens-dial andhaving its rod depending into the case, so as to contact with the brakefor arresting the primary adding-wheel, so that when this key-rod isdepressed the brake will be withdrawn from said primary adding-wheel,and the latter will be returned to zero, (the master-gear having beenpreviously disengaged,) said primary adding wheel having a projectionwhich comes in contact with a stop-arm on the key-rod when the indicatoror hand of the primary addingwheel points at zero. The hundredsaddingwheel is returned to zero by a spring, whicn is=especiallyprovided for this purpose, and is carried within the periphery of saidwheel; and this hundreds-wheel is prevented from retrograde movementwhile in the act of adding up the figures, and is actuated by theprimary adding-wheel by a pawl which engages with a ratchet on saidwheel.- In order therefore to return the hundreds adding-wheel to zeroafter the column of figures has been added, it is necessary to disengagethe pawl from the ratchet on the hundreds-wheel, and with this end inview I mount the hundredswheel on an endwise-movable arbor which is heldin normal position by a flat spring. To this spring is connected the rodofa separate key, which, when depressed, lowers the fiat spring andhundreds-wheel, so that the ratch t of the latter is disengaged from thepawl and the hundreds-wheel can be turned in the reverse direction byits internal spring, the motion of the hundreds-wheel being arrestedwhen the hand or indicator thereof points to zero by a projection on thewheel, which comes in contact with a fixed stop within the case.

My invention further consists in the novel construction and arrangementof parts and combination of devices, as will behereinafter more fullypointed out, and specified. in the claims.

Referring to the accompanying drawings, Figure I is a plan view of mymachine with the cover removed. Fig. II is a longitudinal Verticalsectional view on the line 2 2 of Fig. I. Fig. III is a detail view ofone of the keys and its operating mechanism. Fig. IV is a detail planview of the prime moving mechanism. Fig. V is a transverse verticalsectional view on the line 5 5 of Fig. I. Fig. VI is a top plan view ofthe machine, showing the arrangement of the keys, dials, the. Fig. VIIis a detail View showing arrangement of the levers,

wheel 27 is journaled on a sleeve 24,, which surrounds an arbor 24,which carries the primary tens adding-wheel 1, which is provided on itscircumference with a series of cogs or gear-teeth, one hundred'innumber.

45 designates an arbor or shaft, which is suitably secured in the uppercompartment of the shell or case 63, and which carries a master-gear 2of one hundred and forty cogs, and having a projection 23 secured to thesame and extended beyond its periphery. This master-gear is normally outof gear with the primary adding-wheel, and is adapted, by means to behereinafter described, to be thrown into gear with said primaryaddingwheel 1. This master-gear is normally held out of contact withsaid primary addingwheel by a fiat spring 61, one end of which isrigidly attached to the under side of the floor 41, and the free end ofthis spring (51 bears against the lower end of the arbor 45 to lift thelatter and the master-gear vertically, and thus hold the master'gear outof gear with the primary adding-wheel. To the floor 41 of the shell orcase is secured a stop 20, against which the lateral projection 23 onmaster-gear 2 normally rests.

3 designates the hundreds adding-wheel of one hundred cogs, which ismounted on an endwise-movable arbor 25. This hundreds adding-wheel 3 isadapted to be moved one notch or tooth at a time by a pin or projection26f on the under side of the primary adding-wheel 1, which meshes withits cogs. Thus for every complete revolution of the primary adding-wheell the hundreds adding-wheel 3 will be turned one cog or tooth.

To the upper ends of the wheel-arbors 24c 25 of the primary and hundredsadding-wheels are secured hands or pointers 52 53, which move over thedials 5a 55 on the upper face of the shell or case 63, respectively, andthese adding-wheels are normally in such position that the respectivepointers thereof indicate or point to zero on the dials.

Near the forward end of the uppercompartment of the inclosing-case 63 isjournaled a horizontal rock-shaft 8, having rigidly secured thereto aseries of horizontal arms 9, an arm 10, and an arm 11. This rock-shaft 8is held normally in a stationary position by means of the coiled spring14; but when pressure is applied to any one of the series of arms 9 theshaft 8 turns or rocks in its bearings, and the arms 9 10 11 areconsequently depressed. The free end of the arm 11 on the shaft 8 bearsagainst the upper end of wheel-arbor 45 of the master-gear, and it isadapted to depress said arbor, and thus cause the gear-teeth on themaster-gear 2 to mesh with the teeth on the primary adding-wheel 1. Thearm 10 rests on or over a flat spring 12, which constitutes the brakefor arresting the movement of the primary adding-wheel, one end of whichspring-brake is rigidly scoured to a frame within the case and the otherend of which carries a pin or projection 22, which normally fits betweentwo cogs or gear-teeth of the'primary adding-wheel 1, and

.thus prevents rotation of said primary adding-wheel. The brake isadapted to withdraw the projection 22 from between the teeth of theprimary adding-wheel 1, and thus allow said adding-wheel to be set inmotion by the prime moving mechanism of the machine.

38 designates a bank of keys, which are arranged concentric with themastergear 2 within said case or shell. Each key 38 is mounted on orcarried by one end of a vertical rod 34, which rod passes down throughthe case or shell and the floor 41, and said rod is connected at itslower end to one end of a horizontal lever 32. The fulcrum-block 40 ofthis key-lever is fastened to the floor 42 of the case or shell 63, andto the other end of the lever 32 is secured or connected a shortVertical stop 21, which, when the key 38 and rod 34 are depressed,passes through a perforation in the floor 41, and is projected directlyin the path of the projection or pin 23 on the master-gear to arrest themotion of said master-gear and the primary addingwheel when the samehave turned the number of teeth corresponding to the number of the key.The levers 32 are arranged in two tiers, one above the other, as shownin Fig. II; but said tiers or rows of levers are of different lengths,according to the position of the keys to which they are connected on thekey-board 59. Thus the levers connected to keys which are in the rownearest the master-gear are the shortest, while the levers whose keysare in the last row from the master-gear are the longest, as is obvious.

Each rod 34 of the series of keys carries an arm or member 35, whichextends at right angles from the rod, and the free end of said arm restson one of the arms 9 of the shaft 8. Around each key-rod 34, between thekey 38 and the upper face of the case or shell, is a coiled spring 37,which lifts the rod 34 and its attached key.

The keys 38 are arranged compactly on the keyboard 59 in concentric rowswith the master geai wlieel 2 within the case or shell, and thevertically-movable stops 21, which are actuated by the key-levers 32,are arranged in like manner within the lower compartment of the shell orcase, said stops being normally arranged below and out of the path ofthe projection 23 on the master-gear. The keys and vertically-movablekey-stops are arranged in transverse series, as indicated in Fig. VII.Thus the key No. 2 and its stop are arranged in rear of and slightly outof line with keys No 1 and No.3 and the stops thereof, and the key No. 4and its stop 21 are arranged in the same manner with relation to thekeys Nos. 3 and 5 and their stops. The other keys and stops are arrangedin the same manner, which is important, as the stops are thus compactlydisposed to permit the employment of alarge number of such stops and thearrangement of the same in such manner as to permit the master-gear toturn the desired number of teeth.

ninety-nine (99) keys employed, numbered from 1 to 99, inclusive, and acorresponding number of key-levers and vertically-movable stops 21.

There are The endwise-movable arbor 25 of the hundreds adding-wheel isprovided with a shoulder, on which rests one end of an arm 19, whoseother end is rigidly attached to a rockin g shaft 7, suitably journaledin the ease or shell, and said shaft is provided with a spring 15 fornormally maintaining the shaft 7 in such position that the arm 19 is ina horizontal position. To the arm 19, at a point midwayot' its length,is connected a vertical rod 58, and to the upper end of this red issecured a key 50 for depressing the rod and arm 19 and lowering theadding-wheel. Around the rod 58 and between the lower side of the key 50and the upper face of the case 63 is wound a coiled spring 37 forlifting the rod and key.

The lower end of the wheel-arbor 25 of the hundreds-wheel rests on thefree end of a flat spring 59, which is rigidly secured at its other endto the lower side of the floor 41, whereby the hundreds wheel isnormally raised so that the pawl thereof normally engages with theratchet on said hundredswheel.

One of the arms or spokes of the hundredswheel 3 has secured thereto apin 'or projection 43, which, when the hand or pointer 53 on the upperend of the shaft 25 of said hundreds-wheel points to zero, is in contactwith a depending fixed stop 48 on the lower face of the upper sideof thecase 63.

The hundreds-wheel 3 is prevented from backward movement while in itsnormal raised position by a pawl 17, which is pivoted on the framewithin the case, and said pawl is kept in engagement with the wheel 3 bymeans of a curved spring 16, as shown. (See Fig. I.)

18 represents a stop fixed to the floor 41 of the shell or case to keepthe pawl 17 in position and not interfere with the reverse motion of theratchet of the hundreds-wheel 3 when said hundreds-wheel is lowered bypressure exerted on key 50, whereby the hundredswheel and its ratchetare disengaged from the check-pawl and are free to turn in the reversedirection under the influence of the spring 6 in said hundreds-wheel,which has become wound during the forward movement of said wheel.

To the spring-brake 12, at a point between the stop-pin 22 and the pointwhere the arm 10 of the shaft 8 crosses said spring-brake, is attachedor connected avertical rod 70, which carries at its upper end a key 46,and between the lower side of said key and the top of the case 63 isarranged a coiled spring 60. To this key-rod is secured an arm 47, whichextends outwardly from the rod 70, and when the key 46 and rod 70 aredepressed this arm 47 is thrown into the path of a pin or projection 44,rigidly secured to one of the arms or spokes of the primary adding-wheel1 to arrest the motion of the latter as it is impelled forward by theprime moving mechanism and when the indicator points to zero.

Within the periphery of the master-gear ICU IIO

and the hundreds-wheel 3 are secured springs 5 and 6, respectively,which tend to impel causes the wheel 29 to rotate, and by means saidgear and wheel in the direction indicated by the arrows m for returningsuch wheels to their normal positions. A

On a sleeve 24, surrounding the shaft 24 of the primary adding-wheel 1,near the floor 41, is rigidly secured a gear-wheel 27, which forms apart of the prime moving mechanism, and said wheel 27 has an upturnedrim 31, within which is fastened one end of a motive spring 4, the otherend of which motive spring is attached to the frame of the tens-wheel 1.On the lower end of sleeve 24, below the floor 41, is fastened a pinion27, the cogs of which mesh with the teeth on a gear-wheel 28, which isrigidly attached to an arbor 7 2, having its hearings in the floors 41and 42 of the case or shell. Below the wheel 28, on the same shaft 72 towhich the wheel 28 is secured, is a gearwheel 28, which meshes with agear-wheel 29, carried by an arbor 73, j ournaled in the floors 41 and42 of the case or shell. On the shaft 73, below the wheel 29, is looselyattached a pinion 29, to which pinion is secured one end of a'spring 30,the other end of which spring is secured to the frame of the wheel Thepinion 29' meshes with a wormscrew 51 on the end of a shaft 51, so thatwhen the handle or crank 51 is rotated the pinion 29' is causedtorotate, and thus wind the spring 30 around the shaft '7 3. The pinion 29is kept from backward movement after the spring has been wound by theengagement of the worm on the shaft 51 with the teeth of the pinion 29.

The operation of my invention is as follows: By turning the crank orhandle 51 the shaft 51 is turned, and in turn rotates the pinion 29,which winds up the spring 30, and this of the wheel 29, pinion 28', thewheel 28 and pinion 27, and wheel 27 the spring 4 is wound, the wheel 1being held in a fixed position by the stop 22 between two of its teeth.Vhen one of the keys 38 is depressed, its red 34 is lowered, and the arm35,which bears on one of the arms 9 of the rock-shaft 8, causes thelatter shaft to rock or turn, and the arm 10 depresses the brake 12 andreleases the stop 22 from the teeth of-the wheel 1, and at the same timethe arm 11. lowers the master-gear 2 into engagement with the primaryadding-wheel 1. The spring 4 rotates the primary adding-wheel] and themaster-gear 2 in the directions indicated by the arrows 'm until thestop 23 on the master-gear 2 comes in contact with the post 21, which isthrown up into the path of said projection 23 by and connected to thesame lever 32 as is the rod 34, carrying the key on which pressure isexerted. The hand or pointer52, secured to the upper end of the shaft 24of the primary adding-wheel 1, indicates on the dial 55, which isdirectly over said primary adding-wheel 1, the number of teeth which theprimary wheel 1 has turned. Now, if the pressure exerted on key 38 isremoved, the spring 37 returns the key and rod to their normal position,and this action of said spring is aided by the coiled spring 14, which,as soon as pressure is removed from arm 9 by reason of arm 35 beinglifted, will cause the rock-shaft 3 to return to its normal position,and the stop 22 will return into engagement with the teeth of theprimary wheel 1, while at the same time the spring 61 will raise themastergear 2 out of engagement with the primary wheel 1. Should thenumber of teeth turned by the master-gear 2 be greater than one hundred,which is the limit of the number of cogs on the primary adding-wheel 1and the numbers on the dial 54, the stop or pin 26 on the under side ofthe frame of said primary adding-wheel 1 causes the hundreds-wheel 3 toturn one notch at the time that the primary adding-wheel 1 turns itscomplete revolution, and the pointer 53 secured to the upper end of theshaft 25 of the hundreds-wheel indicates on the dial 54 the number ofcomplete revolutions made by the primary addingwheel 1-in other words,the hundreds added by the machine.

From the foregoing description, taken in connection with the drawings,it will be observed that when one of the keys 38 is depressed the shaft8 is rocked to cause the arms 10 11 thereof to simultaneously depressthe master-gear 2 into engagement with the primary adding --wheel and towithdraw the spring-brake from engagement with the primary adding-wheel,and simultaneously with this movement of parts the key-lever 32 isactuated to raise the movable stop 21 into the path of the projection onthe master-gear. \Vith the brake released from the primary adding-wheeland the latter wheel and master-gear in engagement the two wheels arerotated equally by the prime moving mechanism until the projection onthe master-gear comes in contact with the raised or lifted stop actuatedby the pin, and as the key is released the brake again engages theprimary adding-wheel; but the rock-shaft 8 lifts the arm 11 to allow themaster-gear to be lifted by its spring 61, and thus disengaged from theprimary adding-wheel, so that the mastergear can be returned to itsnormal position by its spring 5, or until the projection 23 thereoncomes against the stop-pin 20. As the primary adding-wheel is locked bythe brake in the position to which it was turned,

its hand or pointer indicates on the dial the amount added. The next keyis depressed and the same action of parts takes place, the primary wheelbeing moved to indicate the sum of the two figures thus added together,and if the sum total of the two amounts thus added exceeds one hundredthe primary adding-wheel moves the hundreds wheel one notch or tooth toindicate such fact, and so on until the completion of the calculation,

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the two pointers indicating on the dials the sum total or the wholeamount thus added together.

In order to return the hand 52 on the primary adding-whecl 1 to zero,the key 46 is depressed, which releases the stop 22 from engagement withthe teeth of the primary wheel 1, and the motive spring 4 turns theprimary wheel until the projection or pin 44 on said wheel comes incontact with the horizontal arm 47 of the key-rod 70, which brings thehand or pointer to zero, and the stop on the under side of the primarywheel 1, which is at a point diametrically opposite to that at whichprojection or pin 44 is secured, into its proper position. When pressureis removed from the key 46, the spring-brake 12 and spring return thekey to its nor mal position, and the brake 12 holds the primary wheel 1against further movement.

To return the hand 53 of the hundredswheel to zero on the dial 54, thekey 50 is de pressed, which causesthe shaft 7 to turn or rock, and thuslowers the free end of the arm 19, which depresses the hundreds-wheel 3below the plane of the pawl 17. The spring 6, which has become woundduring the forward revolution of the hundreds-wheel, causes the latterto rotate in the direction indicated by the arrow m until the pin 43 onone of the arms of the hundreds-wheel 3 comes into contact with thefixed stop 48. As pressure is removed from the key 50, the spring 15returnsthe shaft 7 and the arm 19 to their normal positions and thehundreds-wheel 3 is raised by the pressure of the spring 59, so that itis in position for use again in connection with the primaryadding-wheel.

I am aware that changes in the form and proportion of parts and detailsof construction can be made without departing from the spirit orsacrificing the advantages of my invention, and I would therefore haveit understood that I reserve the right to make such modifications andchanges as fall within the scope of my invention.

Having thus fully described my invention, what I claim as new, anddesire to secure by Letters Patent, is

1. In an adding-machine, the combination of a primary adding-wheel, aprime moving mechanism, substantially as described, connected withsaidprimary adding-wheel for moving the same in one direction, a mastergearnormally free from engagement with the primary adding-wheel, a series ofkeys, a series of stops, each actuated by one of the keys and adapted tobe thrown into the path of the master-gear to arrest the motion of saidmaster-gear and primary adding-wheel, and a brake for holding theprimary wheel stationary after the master-gear is disengaged therefrom,substantially as described, for the purpose set forth.

2. In an adding-machine, the combination of a primary adding-wheel, aprime moving mechanism, substantially as described, for impelling saidwheel in one direction, a master-gear, a series of keys, a series ofstops actuated by said keys, each adapted to be thrown by its key intothe path of the master-gear, a brake for holding the primary wheelstationary after the master-gearisdisengaged therefrom, a device,substantially as described, actuated by depression of either of the keysto move the master-gear into engagement with the primary wheel, and aspring for returning the master-gear to its normal position after itsdisengagement from the primary adding-wheel, substantially as described,for the purpose set forth.

3. In an adding-machine, the combination of a primary adding-wheel, amaster-gear normally free from engagement with the primary wheel,braking mechanism for arresting the motion of the primary wheel on itsaxis, a.

prime moving mechanism, substantially as described, for impelling theprimary wheel in one direction when released from its braking mechanism,a hundreds-wheel adapted to be turned by the primary wheel at suitableintervals, a series of keys, and connections intermediate of either ofthe keys, and the master-gear and braking mechanism,whereby the brakingmechanism is released from the primary wheel simultaneously with theengagement of the master-gear with said primary wheel, substantially asdescribed.

4. In an adding-machine, the combination of a primary adding-wheel, amaster-gear normally free from engagement with said primary wheel, aseries of keys, a series of keylevers connected with the keys and eachhaving a stop which is adapted to be projected into the path of a pin orprojection on the master-gear, and a rock-shaft actuated by the key andhaving means for depressing the master-gear into engagement with theprimary wheel at the same time that the stop on the key-lever isprojected into the path of the projection on the master-gear,substantially as described, for the purpose set forth.

5. In an adding-machine, the combination of a primary adding-wheel, amaster-gear having a pin or projection, a series of verticallymovablestops arranged in concentric rows around the master-gear and normallylying below the plane of the same, a series of keys, each having a rod,and a series of levers intermediate of the key-rods and the stops tomove the latter when said key-rods are de pressed, substantially asdescribed.

6. In an adding-machine, the combination of a primary adding-wheel,amaster-gear having apin or projection and normally free from engagementwith the primary wheel, a series of vertically-movable stops arranged inconcentric rows around the master-gear andnormally lying below the sameor the projection thereon, a series of key-levers for moving the stopsvertically into the path of the projec tion on the master-gear, arock-shaft having an arm which acts to throw the master-gear Y intoengagement with the primary wheel, and

a series of keys, each of which is connected to one of the key-leversand has devices for rocking the shaft when said key-rod is depressed,substantially as described.

7 In an adding-machine, the combination of a primary adding-wheel, aprime moving mechanism for impelling the same in one direction, aspring-brake having a pin which fits between the teeth on the primaryaddingof a primary adding-wheel, a prime moving mechanism for impellingthe primary wheel in one direction, braking mechanism which normallyengages the primary wheel to arrest the motion thereof, a master-gearnormally free from engagement with the primary wheel and having aretracting-spring contained within itself to return the same to itsnormal position, and a projection or stop at its edge, a series ofvertically-movable stops adapted to be thrown into the path of theprojection on the master-gear, a series of keys, and connectionsintern'iediate of the keys, the master-gear, and the braking mechanism,whereby the braking mechanism is engaged with the primary wheel when themaster-gear is thrown out of engagement with said wheel to be returnedto its normal position by the'spring within the same, as and for thepurpose described.

9. In an adding-machine, the combination of a primary adding-wheel, aspring-brake for normally arresting said primary wheel, an independentkey for releasing the brake from the primary Wheel, a prime movingmechanism for impelling said primary wheel until arrested at zero by astop, a spring-controlled hundreds-wheel arranged to be moved by theprimary wheel at suitable intervals, a separate key connected throughdevices with the hundreds-wheel to enable the latter to be returned tothe normal position by its spring, a series of keys, a master-gear, and

mechanism for throwing the master-gear into engagement with the primarywheel and withdrawing the spring-brake from said wheel, as and for thepurpose described.

10. In an adding-machine, the combination of a primary adding-wheel, thekeys, a master-gear, devices intermediate of the keys and master-gear todepress the master-gear into engagement with the primary wheel, a brakefor arrestingthe motion of the primary wheel, an independent key forreleasing the brake from the primary wheel, a spring for returning theprimary wheel to its normal position, and a stop for arresting themotion of the primary wheel when its indicator points to zero,substantially as described.

11. In an adding-machine, the combination of a primary adding-wheel, thekeys, a master-gear, devices for actuating the master-gear on depressionof either of the keys, a prime moving mechanism engaging with theprimary wheel, a brake for arresting the motion of the primary wheel, aspring-controlled independent key adapted to be engaged with the braketo release the latter from the primary wheel, an arm on the primarywheel, and a stop for arresting the motion of said primary Wheel whenits indicator points to zero, substantially as described.

12. In an adding-machine, the combination, with a primary adding wheeland means, substantially as described, for actuating the same, of ahundreds-wheel arranged to be moved at suitable intervals by the primaryWheel, a pawl for arresting the hundredswheel, an independentkey fordepressing the hundreds-wheel out of engagement with the pawl thereof,and a spring for returning the hundreds-wheel to its normal position,substantially as described.

13. In an adding-machine, the combination,

with a primary adding-Wheel, of a hundreds- Wheel arranged to be movedat suitable intervals by the primary wheel, a spring connected to thehundreds-wheel, a check-pawl, which prevents the hundreds-wheel fromretrograde movement under the influence of its spring, a rock-shafthaving an arm which is connected with the arbor of the hundredswheel, anindependent key having a rod connected to the arm of the rock-shaft, anda spring which bears against the arbor of the hundreds-wheel to returnthe same to its normal position, for the purpose described.

ROBERT A. IRION, ELIZABETH IRION.

